Question

Simplifique a expressão: (x+5)²-x(x+3)²

Answer 1

$Resolu\c{c}\~ao\to \left\{\begin{array}{ccc}(x+5)^2-x(x+3)^2\\\\(x^2+10x+25)-x(x^2+6x+9)\\\\x^2+10x+25 - x^3-6x^2-9x\\\\-x^3-5x^2+x+25\end{array}\right$

Espero ter ajudado. :))